The document discusses theories of intelligence and how it has been measured. It describes Sternberg's triarchic theory which defines three types of intelligence: analytical ("book smarts"), creative, and contextual ("street smarts"). It also discusses the history of IQ tests from early attempts correlating skull size to intelligence to modern standardized tests. IQ tests aim to quantify a person's intelligence but issues with reliability and cultural bias can impact the tests' validity in truly measuring intelligence.